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DynamicSupplier.java
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54 lines (46 loc) · 1.15 KB
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// reflection/DynamicSupplier.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.function.Supplier;
import java.util.stream.Stream;
class ID {
private static long counter;
private final long id = counter++;
// A public default constructor is required
// to call getConstructor().newInstance():
public ID() {
}
@Override
public String toString() {
return Long.toString(id);
}
}
public class DynamicSupplier<T> implements Supplier<T> {
private Class<T> type;
public DynamicSupplier(Class<T> type) {
this.type = type;
}
public static void main(String[] args) {
Stream.generate(
new DynamicSupplier<>(ID.class))
.skip(10)
.limit(5)
.forEach(System.out::println);
}
@Override
public T get() {
try {
return type.getConstructor().newInstance();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
/* Output:
10
11
12
13
14
*/